Slag screen



June 2, 1931. 5, JACOBUS 1,808,230

SLAG SCREEN Filed Nov. 5, 1925 2 Sheets-Sheet 1 Fig 1 I [NZENTOR W1 4 M A TTORNE x;

June 2, 1931. f D. s'. JAcoBus 1,808,230

' SLAG SCREEN Filed Nov. 3, 1925 2 Sheets-Sheet 2 Fig-Z. 'f w 15 Z 27 I Z 11v VENTOR 3 BY H W! M ATTORNEYJ Patented June 2, 1931' UNITED STATES PATENT OFFICE DAVID S. JAGOIBUS, OF MONTGLAIR, NEW JERSEY .ASS'IIarNOIEt TO THE IBABOOGK 8c WILGOX COMPANY, OF BAYONNE, JERSEY, A CORPORATION NEW JERSEY same scam Application med November This invention relates to a furnace that is provided with a sla screen and a soot pocket near a wall of the furnace, and will be understood from the description in connection with the accompanying drawings, in which Fig. 1 is a sectional view through a furnace and boiler showing an illustrative embodiment of my invention; Fig. 2 is a section along the line 22 of Fig. 1; Fig. 3 is a section along the line 33 ofFig. 1, and Fig. 4 is an enlarged sectional detail partly broken away.

In the drawings, reference characters 5 and 6 indicate the front and rear walls, respectively, of a furnace that is provided with a burner 7 for fuel, such as oil or pulverized coal, the furnace being illustrated as having a water tube boiler located thereabove to be heated by the hot products of combustion from the furnace.

when it has been attempted to burn fuels of certain sorts, such as pulverized coal, for instance, in furnaces, slag often accumulates upon certain portions of the furnace and adheres tenaciously thereto. This difficulty occurs especially upon portions of the inside of the furnace opposite the convex side of the path of travel of the burning fuel.. By the present invention, a screen for cooling the slag below the temperature that will cause it to adhere to the furnace wall is located in such. a position that the slag in passing through the screen is cooled sufliciently to avoid the usual difliculties that 5 arise because of the hot slag accumulating and sticking in .undesirable places. A slag screen is shown extending along the lower portion of the furnace as being composed of water tubes 8 that are connected at 0 one end to the header 9 and the other end to the header 10, the header 10 being slightly higher than the header 9 so as to cause the tubes 8 to slope upwardly from the header 9 tothe header 10. The header 9 is connected by the tube 11 to a header 12, which is, in turn, connected by the tubes 13 to the steam and water drum 14 of the boiler. A series of tubes 15 connect water druml l to the header 16 and a tube 17 connects this header to another header It has been found that the steam and" 8, 1925. Serial No. 66,628. a

18 located outside of and near. the top of the rear wall. 6 of the furnace. A series of spaced parallel water tubes 19, which constitute a slag screen, connect the headers 10 and 18, these tubes passing horizontally through the rear wall 6 near its upper edge and extending downwardly spaced some distance from this rear wall, leavin a space 20 between the tubes'19, which form this slag screen, and the inside of the rear wall 6. A plate 21 extends across the space 20 between thev tubes 19 and the wall 6 to form a floor, this plate being (Fig. 4) attached to the angle-iron 22 which is, in turn, connected to the tubes 19 by means of the U-bolts 23. The plate 21 slopes downwardly toward the wall 6 and its lower edge rests upon an angle-iron 24 so as to make a sliding jointv toherewith, this angle-iron being connected 3 outlet 26 through the wall 6 is provided above the plate 21 and may be fitted with the usual cover (not shown).

The space between the lower ends of the tubes 19 from a line near the upper edge of the plate 21 are filled with tile 27 down to the header 10. A metal plate 28 is attached by means of the U-bolts 29 to the lower' ends. of the tubes 19 and extends across the tubes 8 in front of the header 10 into contact with the front side of the transverse wall 30, which wall forms the rear side of the lower part of the furnace. The wall 30 is disposed inwardly from the wall 6 and is cooled by the water tube slag screens. Outlets 31 and'32, which may be provided with the usual closures, extend through the floor 33 of the furnace and the wall 30.. A closure 34 is provided to form a casing to prevent infiltration of air into theuspace 20 between the tubes 19 and the a The operation is as follows: The slag that forms in the fuel introduced through the burner 7 passes through the water tube slag screens 8 and 19 and is suflicientlycooled in its passage between the water-filled tubes to prevent the same from sticking to the floor or wall-of the furnace. Theslag that passes between the tubes 19 and is thereby means of the bolts .25 to the wall 6. An

cooled, may strike the wall 6 and then fall.

upon the plate or floor 21 and may be re moved through the opening 26; that which .passes between the tubes Scan be removed through the opening 31 or 32. The sliding joint between the lower edge of the plate 21 and the angle-iron 24 and the sliding joint between the lower edge of the plate a 28 and the face of the wall 30 provide means by which the tubes 8 and 19 can expand and contract with respect to the walls 6 and 30 without permitting air leakage through the joints.

line of the boiler.

' action of said slag, b

It will be understood that the arrangement which I have shown is merely illustrative and that the embodiment of my invention may be widely varied.

It will be seen that there are two vertically disposed walls at the rear of the furnace,

one. wall being set inwardly with respect to the other and that the lower ends of the slag screen forming tubes 19 together with the tile 27 form the. innermost wall, while at the same time the tubes 19 form a cooling means for the outer wall. A similar construction may be used for either the side or the front walls ofthe furnace, or for that matter, all of the furnace walls.

claim:

1. In combination, 'a boiler, a combustion chamber disposed beneath the boiler and having means for burning a slag-producing fuel therein, a vertically extending wall disposed in a position to be subjected to the action of slag in the burning fuel, means spaced inwardly from the wall forming a cooling zone in front thereof to protect it from the action of said slag, and means for the collection and removal of ashes from the space between said means and the wall.

2. In combination, a boiler, a combustion chamber disposed beneath the boilerand having means for burning a slag-producing fuel therein, a vertically extending wall disposed in a position to be subjected to the action of slag in the burning fuel, and a slag screen disposed in front of said wall and spaced therefrom to protect it from the and means in the space etween said screen and wall to remove the cooled slag therefrom. I

3. In combination, a boiler, a combustion chamber disposed beneath the boiler and having means for burning a slag-producing fuel therein, a vertically extending wall disposed in a position to be subjected to the action of slagin the burning fuel, a slag screen formed of a row of spaced water tubes disposed in front of said wall, and

spaced inwardly therefrom, means closing the spaces between at least some of the tubes in the row adjacent the bottom, and means in the space between the screen and wall to remove the cooled slag therefrom.

4. In combination, a boiler, a combustion chamber disposed beneath the boiler and havin means for burning a slag-producing fuel t ierein, a vertically extending wall disposed in a position to be subjected to the action of slag in the burning fuel, a slag screen formed of a row of spaced water tubes disposed in front of said Wall, and spaced inwardly therefrom, means closing the spaces between at least some of the tubes in the row adjacent the lower end thereof, and means in the space between the screen and wall to remove the cooled slag therefrom. r

5. In combination, a boiler, a combustion chamber disposed beneath the boiler and having means for burning a slag-producing fuel therein, a vertically extending wall disposed in a position to be subjected to the action of slag in the burning fuel, a slag screen disposed-in front of said wall and spaced therefrom to protect it from the action of said slag, a discharge opening in said wall, and a floor beneath said opening and extending between the wall and the screen.

6. In combination, a boiler, a combustion chamber disposed beneath the boiler and having means for burning a slag-producing fuel therein, a floor and a vertically extend ing wall each disposed in a position to be subjected to the action of slag in the burning fuel, a slag screen disposed in front of said wall and spaced therefrom, and a second slag screen disposed above said floor and spaced therefrom, and means in the space between the screen and wall to remove the cooled slag therefrom.

7. In combination, a boiler, a combustion .chamber disposed beneath the boiler and therefrom.

DAVID S. JACOBUS. 

